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https://github.com/aljazceru/kata-containers.git
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f4a453b86c
* Move makeNameID() func to virtcontainers/utils file as it's a generic function for making name and ID. * Move bindDevicetoVFIO() and bindDevicetoHost() to vfio driver package. Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
146 lines
3.8 KiB
Go
146 lines
3.8 KiB
Go
// Copyright (c) 2017-2018 Intel Corporation
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// Copyright (c) 2018 Huawei Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package drivers
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import (
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"encoding/hex"
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"path/filepath"
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"github.com/kata-containers/runtime/virtcontainers/device/api"
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"github.com/kata-containers/runtime/virtcontainers/device/config"
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"github.com/kata-containers/runtime/virtcontainers/utils"
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)
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const maxDevIDSize = 31
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// Drive represents a block storage drive which may be used in case the storage
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// driver has an underlying block storage device.
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type Drive struct {
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// Path to the disk-image/device which will be used with this drive
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File string
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// Format of the drive
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Format string
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// ID is used to identify this drive in the hypervisor options.
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ID string
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// Index assigned to the drive. In case of virtio-scsi, this is used as SCSI LUN index
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Index int
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// PCIAddr is the PCI address used to identify the slot at which the drive is attached.
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PCIAddr string
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}
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// BlockDevice refers to a block storage device implementation.
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type BlockDevice struct {
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DevType config.DeviceType
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DeviceInfo config.DeviceInfo
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// SCSI Address of the block device, in case the device is attached using SCSI driver
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// SCSI address is in the format SCSI-Id:LUN
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SCSIAddr string
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// Path at which the device appears inside the VM, outside of the container mount namespace
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VirtPath string
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// PCI Slot of the block device
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PCIAddr string
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BlockDrive *Drive
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}
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// NewBlockDevice creates a new block device based on DeviceInfo
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func NewBlockDevice(devInfo config.DeviceInfo) *BlockDevice {
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return &BlockDevice{
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DevType: config.DeviceBlock,
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DeviceInfo: devInfo,
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}
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}
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// Attach is standard interface of api.Device, it's used to add device to some
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// DeviceReceiver
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func (device *BlockDevice) Attach(devReceiver api.DeviceReceiver) (err error) {
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randBytes, err := utils.GenerateRandomBytes(8)
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if err != nil {
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return err
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}
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device.DeviceInfo.ID = hex.EncodeToString(randBytes)
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// Increment the block index for the sandbox. This is used to determine the name
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// for the block device in the case where the block device is used as container
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// rootfs and the predicted block device name needs to be provided to the agent.
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index, err := devReceiver.GetAndSetSandboxBlockIndex()
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defer func() {
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if err != nil {
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devReceiver.DecrementSandboxBlockIndex()
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}
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}()
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if err != nil {
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return err
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}
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drive := Drive{
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File: device.DeviceInfo.HostPath,
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Format: "raw",
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ID: utils.MakeNameID("drive", device.DeviceInfo.ID, maxDevIDSize),
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Index: index,
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}
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deviceLogger().WithField("device", device.DeviceInfo.HostPath).Info("Attaching block device")
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device.BlockDrive = &drive
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if err = devReceiver.HotplugAddDevice(device, config.DeviceBlock); err != nil {
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return err
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}
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device.DeviceInfo.Hotplugged = true
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driveName, err := utils.GetVirtDriveName(index)
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if err != nil {
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return err
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}
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customOptions := device.DeviceInfo.DriverOptions
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if customOptions != nil && customOptions["block-driver"] == "virtio-blk" {
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device.VirtPath = filepath.Join("/dev", driveName)
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device.PCIAddr = drive.PCIAddr
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} else {
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scsiAddr, err := utils.GetSCSIAddress(index)
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if err != nil {
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return err
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}
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device.SCSIAddr = scsiAddr
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}
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return nil
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}
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// Detach is standard interface of api.Device, it's used to remove device from some
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// DeviceReceiver
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func (device *BlockDevice) Detach(devReceiver api.DeviceReceiver) error {
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if device.DeviceInfo.Hotplugged {
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deviceLogger().WithField("device", device.DeviceInfo.HostPath).Info("Unplugging block device")
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if err := devReceiver.HotplugRemoveDevice(device, config.DeviceBlock); err != nil {
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deviceLogger().WithError(err).Error("Failed to unplug block device")
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return err
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}
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}
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return nil
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}
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// DeviceType is standard interface of api.Device, it returns device type
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func (device *BlockDevice) DeviceType() config.DeviceType {
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return device.DevType
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}
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